JP2019506316A - Equipment for blow molded plastic containers - Google Patents

Abstract

An apparatus for a blow molded plastic container comprising at least one blow molding station defining at least one molding cavity for forming the plastic container, the blow molding station comprising two lateral bodies and a blow molding For each forming cavity defined by the station, a bottom (1) is provided, the bottom (1) defining an annular portion extending around the stretching axis (100) of the respective forming cavity. An outer body (2), an inner body (3) that can be accommodated at least partially inside the annular part, an outer surface (3a) of the inner body (3) and an inner surface (2b) of the annular part. In between, at least one air outlet (4) extending around the stretching axis (100) and connected to the first air outlet means, ), To the annular portion along the stretching axis (100), it can be adjustably moved in response to the instruction. (Figure 2)

Description

  The present invention relates to an apparatus for blow molded plastic containers.

  Typically, an apparatus for such a blow molded plastic container comprises a blow molding station that defines one or more molding cavities to form the container.

  In particular, the blow molding station comprises two lateral bodies and a respective bottom for each forming cavity defined by the blow molding station.

  From an open state in which a preform or a plurality of preforms can be supplied and a blown container can be discharged, in a closed state in which a preformed blow molding is performed to obtain the container, In order to allow the transition of the forming station, the at least one lateral body can be moved in response to instructions using the circulating opening and closing means, with the bottom intact.

  During the blow molding operation, it is necessary to exhaust this air from the mold because it prevents the correct formation of the container.

  Such evacuation is usually accomplished by providing an air exhaust duct that leads to the mold.

While such a solution is conceptually effective, it has several drawbacks.
In particular, the effectiveness and speed of the air discharge is proportional to the so-called total exhaust cross section corresponding to the sum of the hole area of the discharge duct.

  For this reason it is preferable to have a large number of discharge ducts, but for structural reasons it is not always possible to position them where they are needed without interrupting the cooling circuit. Absent.

  In order to increase the total exhaust cross section without compromising the quality of the molding, one solution is presented in French patent application No. 2947755 under the name of Comep, which provides the bottom in two parts It is necessary to do.

  In particular, the two portions define a plurality of radially extending indentations and an annular outer body angularly spaced from each other, and a plurality of complementary shapes designed to engage the corresponding indentations. An internal body having a protruding portion is provided.

  The inner body is thus fixed relative to the outer body such that an annular outlet extending around the bottom axis is provided between the two bodies, connected to one or more air outlet ducts. The

While such a solution is conceptually effective, it has several drawbacks.
First, it should be noted that in the design stage, a corresponding optimal positioning between the inner body and the outer body needs to be considered as a function of the shape of the container to be molded.

  This is the flexibility of the use of the above solution because the bottom needs to be further redesigned if it is necessary to slightly reduce or increase the internal volume of the container to be obtained. Considerably lower.

  The object of the present invention is to overcome the above-mentioned problems and overcome the drawbacks by providing a device for blow molded plastic containers that is significantly simpler and more practically used.

  For this purpose, the object of the invention is to make available an apparatus for a blow-molded plastic container that makes it possible to discharge air very effectively during a blow-molding operation.

  Another object of the present invention is to provide an apparatus for a blow molded plastic container that allows reducing or increasing the internal volume of the container to be obtained without redesigning or repositioning the bottom. is there.

  This object and these and other objects, which will become apparent hereinafter, are achieved by an apparatus for a blow molded plastic container according to claim 1.

  Further characteristics and advantages of the invention emerge from the description of several preferred but non-exclusive embodiments of the apparatus for blow-molded plastic containers according to the invention, which are illustrated as non-limiting examples in the accompanying drawings It will be.

It is the figure which looked at the bottom which concerns on this invention from the top. FIG. 6 is a cross-sectional view of the bottom according to the present invention with the central body located at three different positions relative to the outer body. FIG. 6 is a cross-sectional view of the bottom according to the present invention with the central body located at three different positions relative to the outer body. FIG. 6 is a cross-sectional view of the bottom according to the present invention with the central body located at three different positions relative to the outer body.

  In the embodiments illustrated below, individual characteristics shown in relation to a particular example may actually be exchanged for other different characteristics that exist in other embodiments.

Referring to the drawings, the present invention relates to an apparatus for a blow molded plastic container.
The apparatus comprises at least one blow molding station that defines at least one molding cavity for forming the plastic container.

  The blow molding station comprises two lateral bodies and a bottom 1 for each forming cavity defined by the blow molding station.

  Conveniently, at least one of the side bodies can be moved in response to instructions using a cyclic opening and closing means, leaving the bottom intact, thereby supplying a preform or a plurality of preforms. Allows a transition of the forming station from an open state where the blow molded container can be discharged to a closed state where blow molding is performed to obtain the container from the preform.

  In accordance with the present invention, the bottom 1 comprises a bottom outer body 2 and an inner body 3 that define an annular portion extending around the stretching axis 100 of each forming cavity.

The inner body 3 can be at least partially housed inside the annular portion.
There is at least one air outlet 4 between the outer surface 3a of the inner body 3 and the inner surface 2b of the annular part, which extends around the stretching axis 100 and is connected to the first air outlet means. The

  Furthermore, the inner main body 3 is movable along the extending axis 100 so as to be adjustable with respect to the annular portion according to an instruction.

  The presence of the outlet 4 obviously makes it possible to increase the total exhaust surface and thus clearly reduce the pressure required for the shaping.

  The possibility of adjusting the position of the inner body 3 with respect to the outer body 2 further makes it possible to adjust the volume of the cavity (and therefore of the container) and optionally also the total exhaust surface.

  Preferably, the outlet 4 has a continuous extension in a closed loop that extends around the extension axis 100.

Conveniently, the inner surface 2b of the annular part has a substantially cylindrical extension.
Advantageously, the first air exhaust means comprises a plurality of first exhaust channels 7 opening in the inner surface 2b of the annular part.

  The first discharge channels 7 extend substantially radially with respect to the stretching axis 100 and are angularly spaced from one another.

  Conveniently, the outer body 2 defines a lateral region 11 of the receiving cavity and a bottom region 12 of the cavity that is arranged continuously in the lateral region 11.

  Preferably, the bottom 1 is associated with a steering body for adjusting the position of the inner body 3 relative to the annular part along the extension axis 100.

  Conveniently, the bottom 1 defines a plurality of radial ridges 6 adapted to make it possible to obtain a petal-like shape at the bottom of the container.

  Each of the radial ridges 6 includes a first ridge 6 a defined on the outer body 2 and a second ridge 6 b defined on the inner body 3.

Preferably, the bottom 1 defines a second air exhaust channel 5.
With reference to the embodiment shown in the figures, a second air exhaust channel 5 is defined on the outer body 2 and continues close to the edge of the first ridge 6a.

  In fact, it has been found that the present invention can satisfactorily achieve the objectives and multiple objectives set in all embodiments.

  The present invention is therefore subject to numerous modifications and variations, all of which are considered to be within the scope of the appended claims.

  In practice, the materials used may be arbitrary depending on the requirements, provided that they are compatible with the particular application, dimensions and shape.

Moreover, all details may be replaced by other technically equivalent elements.
The disclosures in Italian Patent Application No. 102016000018800 (UB2016A001012) from which this application claims priority are incorporated herein by reference.

  Where technical features recited in any claim are followed by reference signs, these reference signs are included for the sole purpose of increasing the clarity of the claims, and as such Such reference signs do not have any limiting effect on the interpretation of each element identified by such reference signs.

Claims (10)

  An apparatus for a blow molded plastic container comprising at least one blow molding station defining at least one molding cavity for forming a plastic container, the blow molding station comprising two lateral bodies, A bottom (1) for each forming cavity defined by a blow molding station, wherein the bottom (1) defines an annular portion extending around an extension axis (100) of the respective forming cavity, An outer body (2) at the bottom, an inner body (3) that can be at least partially accommodated inside the annular part, an outer surface (3a) of the inner body (3) and an inner surface of the annular part (2b) at least one air extending around the stretching axis (100) and connected to the first air discharge means And an outlet (4), wherein the inner body (3) is movable relative to the annular portion along the extension axis (100) in accordance with instructions. Equipment for blow molded plastic containers.   The apparatus for blow-molded plastic containers according to claim 1, characterized in that the outlet (4) has a continuous stretch in a closed loop extending around the stretch axis (100).   The inner surface (2b) of the annular portion has a substantially cylindrical extension, and the first air discharge means has a plurality of first discharges opened at the inner surface (2b) of the annular portion. Device for a blow-molded plastic container according to any one of the preceding claims, characterized in that it comprises a channel (7).   Any of the preceding claims, characterized in that the first discharge channel (7) extends substantially radially with respect to the stretching axis (100) and is angularly spaced from one another. An apparatus for blow molded plastic containers according to claim 1.   The outer body (2) defines a side region (11) of the cavity and a bottom region (12) of the cavity, which is arranged continuously with the side region (11), as described above. Apparatus for blow molded plastic containers according to any one of the preceding claims.   6. A control body according to any one of the preceding claims, characterized in that it comprises a control body for adjusting the position of the inner body (3) relative to the annular part along the extension axis (100). Equipment for blow molded plastic containers.   Device for blow-molded plastic containers according to any one of the preceding claims, characterized in that the bottom (1) defines a plurality of radial ridges (6).   The radial ridge (6) comprises a first ridge (6a) defined on the outer body (2) and a second ridge (6b) defined on the inner body (3), respectively. Device for blow-molded plastic containers according to any one of the preceding claims, characterized in that it comprises.   Device for blow-molded plastic containers according to any one of the preceding claims, characterized in that the bottom (1) defines a second air exhaust channel (5).   Said second air outlet channel (5) is defined on said outer body (2) and opens close to the edge of said first ridge (6a) An apparatus for a blow molded plastic container according to any one of the preceding claims.

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